Remove RenderBlockLineLayout

sky/engine/core/rendering/RenderParagraph.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sky/engine/config.h"
 #include "sky/engine/core/rendering/RenderParagraph.h"
 
+#include "sky/engine/core/rendering/BidiRunForLine.h"
 #include "sky/engine/core/rendering/InlineIterator.h"
+#include "sky/engine/core/rendering/RenderLayer.h"
+#include "sky/engine/core/rendering/RenderObjectInlines.h"
+#include "sky/engine/core/rendering/RenderView.h"
+#include "sky/engine/core/rendering/TextRunConstructor.h"
+#include "sky/engine/core/rendering/TrailingFloatsRootInlineBox.h"
+#include "sky/engine/core/rendering/VerticalPositionCache.h"
+#include "sky/engine/core/rendering/line/BreakingContextInlineHeaders.h"
+#include "sky/engine/core/rendering/line/LineLayoutState.h"
+#include "sky/engine/core/rendering/line/LineWidth.h"
+#include "sky/engine/core/rendering/line/RenderTextInfo.h"
+#include "sky/engine/core/rendering/line/WordMeasurement.h"
+#include "sky/engine/platform/fonts/Character.h"
+#include "sky/engine/platform/text/BidiResolver.h"
+#include "sky/engine/wtf/RefCountedLeakCounter.h"
+#include "sky/engine/wtf/StdLibExtras.h"
+#include "sky/engine/wtf/Vector.h"
+#include "sky/engine/wtf/unicode/CharacterNames.h"
+
 
 namespace blink {
 
+using namespace WTF::Unicode;
+
 RenderParagraph::RenderParagraph(ContainerNode* node)
     : RenderBlockFlow(node)
 {
 }
 
 RenderParagraph::~RenderParagraph()
 {
 }
 
 RenderParagraph* RenderParagraph::createAnonymous(Document& document)
@@ skipping 43 matching lines @@
 void RenderParagraph::paintContents(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     m_lineBoxes.paint(this, paintInfo, paintOffset);
 }
 
 bool RenderParagraph::hitTestContents(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
 {
     return m_lineBoxes.hitTest(this, request, result, locationInContainer, accumulatedOffset, hitTestAction);
 }
 
+void RenderParagraph::markLinesDirtyInBlockRange(LayoutUnit logicalTop, LayoutUnit logicalBottom, RootInlineBox* highest)
+{
+    if (logicalTop >= logicalBottom)
+        return;
+
+    RootInlineBox* lowestDirtyLine = lastRootBox();
+    RootInlineBox* afterLowest = lowestDirtyLine;
+    while (lowestDirtyLine && lowestDirtyLine->lineBottomWithLeading() >= logicalBottom && logicalBottom < LayoutUnit::max()) {
+        afterLowest = lowestDirtyLine;
+        lowestDirtyLine = lowestDirtyLine->prevRootBox();
+    }
+
+    while (afterLowest && afterLowest != highest && (afterLowest->lineBottomWithLeading() >= logicalTop || afterLowest->lineBottomWithLeading() < 0)) {
+        afterLowest->markDirty();
+        afterLowest = afterLowest->prevRootBox();
+    }
+}
+
+static inline InlineBox* createInlineBoxForRenderer(RenderObject* obj, bool isRootLineBox, bool isOnlyRun = false)
+{
+    if (isRootLineBox)
+        return toRenderBlockFlow(obj)->createAndAppendRootInlineBox();
+
+    if (obj->isText()) {
+        InlineTextBox* textBox = toRenderText(obj)->createInlineTextBox();
+        // We only treat a box as text for a <br> if we are on a line by ourself or in strict mode
+        // (Note the use of strict mode.  In "almost strict" mode, we don't treat the box for <br> as text.)
+        return textBox;
+    }
+
+    if (obj->isBox())
+        return toRenderBox(obj)->createInlineBox();
+
+    return toRenderInline(obj)->createAndAppendInlineFlowBox();
+}
+
+static inline void dirtyLineBoxesForRenderer(RenderObject* o, bool fullLayout)
+{
+    if (o->isText()) {
+        RenderText* renderText = toRenderText(o);
+        renderText->dirtyLineBoxes(fullLayout);
+    } else
+        toRenderInline(o)->dirtyLineBoxes(fullLayout);
+}
+
+static bool parentIsConstructedOrHaveNext(InlineFlowBox* parentBox)
+{
+    do {
+        if (parentBox->isConstructed() || parentBox->nextOnLine())
+            return true;
+        parentBox = parentBox->parent();
+    } while (parentBox);
+    return false;
+}
+
+InlineFlowBox* RenderParagraph::createLineBoxes(RenderObject* obj, const LineInfo& lineInfo, InlineBox* childBox)
+{
+    // See if we have an unconstructed line box for this object that is also
+    // the last item on the line.
+    unsigned lineDepth = 1;
+    InlineFlowBox* parentBox = 0;
+    InlineFlowBox* result = 0;
+    bool hasDefaultLineBoxContain = style()->lineBoxContain() == RenderStyle::initialLineBoxContain();
+    do {
+        ASSERT_WITH_SECURITY_IMPLICATION(obj->isRenderInline() || obj == this);
+
+        RenderInline* inlineFlow = (obj != this) ? toRenderInline(obj) : 0;
+
+        // Get the last box we made for this render object.
+        parentBox = inlineFlow ? inlineFlow->lastLineBox() : toRenderBlock(obj)->lastLineBox();
+
+        // If this box or its ancestor is constructed then it is from a previous line, and we need
+        // to make a new box for our line.  If this box or its ancestor is unconstructed but it has
+        // something following it on the line, then we know we have to make a new box
+        // as well.  In this situation our inline has actually been split in two on
+        // the same line (this can happen with very fancy language mixtures).
+        bool constructedNewBox = false;
+        bool allowedToConstructNewBox = !hasDefaultLineBoxContain || !inlineFlow || inlineFlow->alwaysCreateLineBoxes();
+        bool canUseExistingParentBox = parentBox && !parentIsConstructedOrHaveNext(parentBox);
+        if (allowedToConstructNewBox && !canUseExistingParentBox) {
+            // We need to make a new box for this render object.  Once
+            // made, we need to place it at the end of the current line.
+            InlineBox* newBox = createInlineBoxForRenderer(obj, obj == this);
+            ASSERT_WITH_SECURITY_IMPLICATION(newBox->isInlineFlowBox());
+            parentBox = toInlineFlowBox(newBox);
+            parentBox->setFirstLineStyleBit(lineInfo.isFirstLine());
+            if (!hasDefaultLineBoxContain)
+                parentBox->clearDescendantsHaveSameLineHeightAndBaseline();
+            constructedNewBox = true;
+        }
+
+        if (constructedNewBox || canUseExistingParentBox) {
+            if (!result)
+                result = parentBox;
+
+            // If we have hit the block itself, then |box| represents the root
+            // inline box for the line, and it doesn't have to be appended to any parent
+            // inline.
+            if (childBox)
+                parentBox->addToLine(childBox);
+
+            if (!constructedNewBox || obj == this)
+                break;
+
+            childBox = parentBox;
+        }
+
+        // If we've exceeded our line depth, then jump straight to the root and skip all the remaining
+        // intermediate inline flows.
+        obj = (++lineDepth >= cMaxLineDepth) ? this : obj->parent();
+
+    } while (true);
+
+    return result;
+}
+
+template <typename CharacterType>
+static inline bool endsWithASCIISpaces(const CharacterType* characters, unsigned pos, unsigned end)
+{
+    while (isASCIISpace(characters[pos])) {
+        pos++;
+        if (pos >= end)
+            return true;
+    }
+    return false;
+}
+
+static bool reachedEndOfTextRenderer(const BidiRunList<BidiRun>& bidiRuns)
+{
+    BidiRun* run = bidiRuns.logicallyLastRun();
+    if (!run)
+        return true;
+    unsigned pos = run->stop();
+    RenderObject* r = run->m_object;
+    if (!r->isText())
+        return false;
+    RenderText* renderText = toRenderText(r);
+    unsigned length = renderText->textLength();
+    if (pos >= length)
+        return true;
+
+    if (renderText->is8Bit())
+        return endsWithASCIISpaces(renderText->characters8(), pos, length);
+    return endsWithASCIISpaces(renderText->characters16(), pos, length);
+}
+
+RootInlineBox* RenderParagraph::constructLine(BidiRunList<BidiRun>& bidiRuns, const LineInfo& lineInfo)
+{
+    ASSERT(bidiRuns.firstRun());
+
+    bool rootHasSelectedChildren = false;
+    InlineFlowBox* parentBox = 0;
+    int runCount = bidiRuns.runCount() - lineInfo.runsFromLeadingWhitespace();
+    for (BidiRun* r = bidiRuns.firstRun(); r; r = r->next()) {
+        // Create a box for our object.
+        bool isOnlyRun = (runCount == 1);
+        if (runCount == 2)
+            isOnlyRun = false;
+
+        if (lineInfo.isEmpty())
+            continue;
+
+        InlineBox* box = createInlineBoxForRenderer(r->m_object, false, isOnlyRun);
+        r->m_box = box;
+
+        ASSERT(box);
+        if (!box)
+            continue;
+
+        if (!rootHasSelectedChildren && box->renderer().selectionState() != RenderObject::SelectionNone)
+            rootHasSelectedChildren = true;
+
+        // If we have no parent box yet, or if the run is not simply a sibling,
+        // then we need to construct inline boxes as necessary to properly enclose the
+        // run's inline box. Segments can only be siblings at the root level, as
+        // they are positioned separately.
+        if (!parentBox || parentBox->renderer() != r->m_object->parent()) {
+            // Create new inline boxes all the way back to the appropriate insertion point.
+            parentBox = createLineBoxes(r->m_object->parent(), lineInfo, box);
+        } else {
+            // Append the inline box to this line.
+            parentBox->addToLine(box);
+        }
+
+        box->setBidiLevel(r->level());
+
+        if (box->isInlineTextBox()) {
+            InlineTextBox* text = toInlineTextBox(box);
+            text->setStart(r->m_start);
+            text->setLen(r->m_stop - r->m_start);
+            text->setDirOverride(r->dirOverride());
+            if (r->m_hasHyphen)
+                text->setHasHyphen(true);
+        }
+    }
+
+    ASSERT(lastLineBox() && !lastLineBox()->isConstructed());
+
+    // Set the m_selectedChildren flag on the root inline box if one of the leaf inline box
+    // from the bidi runs walk above has a selection state.
+    if (rootHasSelectedChildren)
+        lastLineBox()->root().setHasSelectedChildren(true);
+
+    // Set bits on our inline flow boxes that indicate which sides should
+    // paint borders/margins/padding.  This knowledge will ultimately be used when
+    // we determine the horizontal positions and widths of all the inline boxes on
+    // the line.
+    bool isLogicallyLastRunWrapped = bidiRuns.logicallyLastRun()->m_object && bidiRuns.logicallyLastRun()->m_object->isText() ? !reachedEndOfTextRenderer(bidiRuns) : true;
+    lastLineBox()->determineSpacingForFlowBoxes(lineInfo.isLastLine(), isLogicallyLastRunWrapped, bidiRuns.logicallyLastRun()->m_object);
+
+    // Now mark the line boxes as being constructed.
+    lastLineBox()->setConstructed();
+
+    // Return the last line.
+    return lastRootBox();
+}
+
+ETextAlign RenderParagraph::textAlignmentForLine(bool endsWithSoftBreak) const
+{
+    ETextAlign alignment = style()->textAlign();
+    if (endsWithSoftBreak)
+        return alignment;
+
+    if (!RuntimeEnabledFeatures::css3TextEnabled())
+        return (alignment == JUSTIFY) ? TASTART : alignment;
+
+    if (alignment != JUSTIFY)
+        return alignment;
+
+    TextAlignLast alignmentLast = style()->textAlignLast();
+    switch (alignmentLast) {
+    case TextAlignLastStart:
+        return TASTART;
+    case TextAlignLastEnd:
+        return TAEND;
+    case TextAlignLastLeft:
+        return LEFT;
+    case TextAlignLastRight:
+        return RIGHT;
+    case TextAlignLastCenter:
+        return CENTER;
+    case TextAlignLastJustify:
+        return JUSTIFY;
+    case TextAlignLastAuto:
+        if (style()->textJustify() == TextJustifyDistribute)
+            return JUSTIFY;
+        return TASTART;
+    }
+
+    return alignment;
+}
+
+static inline void setLogicalWidthForTextRun(RootInlineBox* lineBox, BidiRun* run, RenderText* renderer, float xPos, const LineInfo& lineInfo,
+                                             GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache, WordMeasurements& wordMeasurements)
+{
+    HashSet<const SimpleFontData*> fallbackFonts;
+    GlyphOverflow glyphOverflow;
+
+    const Font& font = renderer->style(lineInfo.isFirstLine())->font();
+    // Always compute glyph overflow if the block's line-box-contain value is "glyphs".
+    if (lineBox->fitsToGlyphs()) {
+        // If we don't stick out of the root line's font box, then don't bother computing our glyph overflow. This optimization
+        // will keep us from computing glyph bounds in nearly all cases.
+        bool includeRootLine = lineBox->includesRootLineBoxFontOrLeading();
+        int baselineShift = lineBox->verticalPositionForBox(run->m_box, verticalPositionCache);
+        int rootDescent = includeRootLine ? font.fontMetrics().descent() : 0;
+        int rootAscent = includeRootLine ? font.fontMetrics().ascent() : 0;
+        int boxAscent = font.fontMetrics().ascent() - baselineShift;
+        int boxDescent = font.fontMetrics().descent() + baselineShift;
+        if (boxAscent > rootDescent ||  boxDescent > rootAscent)
+            glyphOverflow.computeBounds = true;
+    }
+
+    LayoutUnit hyphenWidth = 0;
+    if (toInlineTextBox(run->m_box)->hasHyphen()) {
+        const Font& font = renderer->style(lineInfo.isFirstLine())->font();
+        hyphenWidth = measureHyphenWidth(renderer, font, run->direction());
+    }
+    float measuredWidth = 0;
+
+    bool kerningIsEnabled = font.fontDescription().typesettingFeatures() & Kerning;
+
+    bool canUseSimpleFontCodePath = renderer->canUseSimpleFontCodePath();
+
+    // Since we don't cache glyph overflows, we need to re-measure the run if
+    // the style is linebox-contain: glyph.
+
+    if (!lineBox->fitsToGlyphs() && canUseSimpleFontCodePath) {
+        int lastEndOffset = run->m_start;
+        for (size_t i = 0, size = wordMeasurements.size(); i < size && lastEndOffset < run->m_stop; ++i) {
+            const WordMeasurement& wordMeasurement = wordMeasurements[i];
+            if (wordMeasurement.width <=0 || wordMeasurement.startOffset == wordMeasurement.endOffset)
+                continue;
+            if (wordMeasurement.renderer != renderer || wordMeasurement.startOffset != lastEndOffset || wordMeasurement.endOffset > run->m_stop)
+                continue;
+
+            lastEndOffset = wordMeasurement.endOffset;
+            if (kerningIsEnabled && lastEndOffset == run->m_stop) {
+                int wordLength = lastEndOffset - wordMeasurement.startOffset;
+                measuredWidth += renderer->width(wordMeasurement.startOffset, wordLength, xPos, run->direction(), lineInfo.isFirstLine());
+                if (i > 0 && wordLength == 1 && renderer->characterAt(wordMeasurement.startOffset) == ' ')
+                    measuredWidth += renderer->style()->wordSpacing();
+            } else
+                measuredWidth += wordMeasurement.width;
+            if (!wordMeasurement.fallbackFonts.isEmpty()) {
+                HashSet<const SimpleFontData*>::const_iterator end = wordMeasurement.fallbackFonts.end();
+                for (HashSet<const SimpleFontData*>::const_iterator it = wordMeasurement.fallbackFonts.begin(); it != end; ++it)
+                    fallbackFonts.add(*it);
+            }
+        }
+        if (measuredWidth && lastEndOffset != run->m_stop) {
+            // If we don't have enough cached data, we'll measure the run again.
+            measuredWidth = 0;
+            fallbackFonts.clear();
+        }
+    }
+
+    if (!measuredWidth)
+        measuredWidth = renderer->width(run->m_start, run->m_stop - run->m_start, xPos, run->direction(), lineInfo.isFirstLine(), &fallbackFonts, &glyphOverflow);
+
+    run->m_box->setLogicalWidth(measuredWidth + hyphenWidth);
+    if (!fallbackFonts.isEmpty()) {
+        ASSERT(run->m_box->isText());
+        GlyphOverflowAndFallbackFontsMap::ValueType* it = textBoxDataMap.add(toInlineTextBox(run->m_box), std::make_pair(Vector<const SimpleFontData*>(), GlyphOverflow())).storedValue;
+        ASSERT(it->value.first.isEmpty());
+        copyToVector(fallbackFonts, it->value.first);
+        run->m_box->parent()->clearDescendantsHaveSameLineHeightAndBaseline();
+    }
+    if (!glyphOverflow.isZero()) {
+        ASSERT(run->m_box->isText());
+        GlyphOverflowAndFallbackFontsMap::ValueType* it = textBoxDataMap.add(toInlineTextBox(run->m_box), std::make_pair(Vector<const SimpleFontData*>(), GlyphOverflow())).storedValue;
+        it->value.second = glyphOverflow;
+        run->m_box->clearKnownToHaveNoOverflow();
+    }
+}
+
+static inline void computeExpansionForJustifiedText(BidiRun* firstRun, BidiRun* trailingSpaceRun, Vector<unsigned, 16>& expansionOpportunities, unsigned expansionOpportunityCount, float& totalLogicalWidth, float availableLogicalWidth)
+{
+    if (!expansionOpportunityCount || availableLogicalWidth <= totalLogicalWidth)
+        return;
+
+    size_t i = 0;
+    for (BidiRun* r = firstRun; r; r = r->next()) {
+        if (!r->m_box || r == trailingSpaceRun)
+            continue;
+
+        if (r->m_object->isText()) {
+            unsigned opportunitiesInRun = expansionOpportunities[i++];
+
+            ASSERT(opportunitiesInRun <= expansionOpportunityCount);
+
+            // Don't justify for white-space: pre.
+            if (r->m_object->style()->whiteSpace() != PRE) {
+                InlineTextBox* textBox = toInlineTextBox(r->m_box);
+                int expansion = (availableLogicalWidth - totalLogicalWidth) * opportunitiesInRun / expansionOpportunityCount;
+                textBox->setExpansion(expansion);
+                totalLogicalWidth += expansion;
+            }
+            expansionOpportunityCount -= opportunitiesInRun;
+            if (!expansionOpportunityCount)
+                break;
+        }
+    }
+}
+
+static void updateLogicalInlinePositions(RenderParagraph* block, float& lineLogicalLeft, float& lineLogicalRight, float& availableLogicalWidth, IndentTextOrNot shouldIndentText)
+{
+    lineLogicalLeft = block->logicalLeftOffsetForLine(shouldIndentText == IndentText).toFloat();
+    lineLogicalRight = block->logicalRightOffsetForLine(shouldIndentText == IndentText).toFloat();
+    availableLogicalWidth = lineLogicalRight - lineLogicalLeft;
+}
+
+void RenderParagraph::computeInlineDirectionPositionsForLine(RootInlineBox* lineBox, const LineInfo& lineInfo, BidiRun* firstRun, BidiRun* trailingSpaceRun, bool reachedEnd,
+                                                         GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache, WordMeasurements& wordMeasurements)
+{
+    ETextAlign textAlign = textAlignmentForLine(!reachedEnd && !lineBox->endsWithBreak());
+
+    // CSS 2.1: "'Text-indent' only affects a line if it is the first formatted line of an element. For example, the first line of an anonymous block
+    // box is only affected if it is the first child of its parent element."
+    // CSS3 "text-indent", "each-line" affects the first line of the block container as well as each line after a forced line break,
+    // but does not affect lines after a soft wrap break.
+    bool isFirstLine = lineInfo.isFirstLine() && !(isAnonymousBlock() && parent()->slowFirstChild() != this);
+    bool isAfterHardLineBreak = lineBox->prevRootBox() && lineBox->prevRootBox()->endsWithBreak();
+    IndentTextOrNot shouldIndentText = requiresIndent(isFirstLine, isAfterHardLineBreak, style());
+    float lineLogicalLeft;
+    float lineLogicalRight;
+    float availableLogicalWidth;
+    updateLogicalInlinePositions(this, lineLogicalLeft, lineLogicalRight, availableLogicalWidth, shouldIndentText);
+    bool needsWordSpacing;
+
+    if (firstRun && firstRun->m_object->isReplaced())
+        updateLogicalInlinePositions(this, lineLogicalLeft, lineLogicalRight, availableLogicalWidth, shouldIndentText);
+
+    computeInlineDirectionPositionsForSegment(lineBox, lineInfo, textAlign, lineLogicalLeft, availableLogicalWidth, firstRun, trailingSpaceRun, textBoxDataMap, verticalPositionCache, wordMeasurements);
+    // The widths of all runs are now known. We can now place every inline box (and
+    // compute accurate widths for the inline flow boxes).
+    needsWordSpacing = false;
+    lineBox->placeBoxesInInlineDirection(lineLogicalLeft, needsWordSpacing);
+}
+
+BidiRun* RenderParagraph::computeInlineDirectionPositionsForSegment(RootInlineBox* lineBox, const LineInfo& lineInfo, ETextAlign textAlign, float& logicalLeft,
+    float& availableLogicalWidth, BidiRun* firstRun, BidiRun* trailingSpaceRun, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache,
+    WordMeasurements& wordMeasurements)
+{
+    bool needsWordSpacing = true;
+    float totalLogicalWidth = lineBox->getFlowSpacingLogicalWidth().toFloat();
+    unsigned expansionOpportunityCount = 0;
+    bool isAfterExpansion = true;
+    Vector<unsigned, 16> expansionOpportunities;
+    RenderObject* previousObject = 0;
+    TextJustify textJustify = style()->textJustify();
+
+    BidiRun* r = firstRun;
+    for (; r; r = r->next()) {
+        if (!r->m_box || r->m_object->isOutOfFlowPositioned() || r->m_box->isLineBreak())
+            continue; // Positioned objects are only participating to figure out their
+                      // correct static x position.  They have no effect on the width.
+                      // Similarly, line break boxes have no effect on the width.
+        if (r->m_object->isText()) {
+            RenderText* rt = toRenderText(r->m_object);
+            if (textAlign == JUSTIFY && r != trailingSpaceRun && textJustify != TextJustifyNone) {
+                if (!isAfterExpansion)
+                    toInlineTextBox(r->m_box)->setCanHaveLeadingExpansion(true);
+                unsigned opportunitiesInRun;
+                if (rt->is8Bit())
+                    opportunitiesInRun = Character::expansionOpportunityCount(rt->characters8() + r->m_start, r->m_stop - r->m_start, r->m_box->direction(), isAfterExpansion);
+                else
+                    opportunitiesInRun = Character::expansionOpportunityCount(rt->characters16() + r->m_start, r->m_stop - r->m_start, r->m_box->direction(), isAfterExpansion);
+                expansionOpportunities.append(opportunitiesInRun);
+                expansionOpportunityCount += opportunitiesInRun;
+            }
+
+            if (rt->textLength()) {
+                if (!r->m_start && needsWordSpacing && isSpaceOrNewline(rt->characterAt(r->m_start)))
+                    totalLogicalWidth += rt->style(lineInfo.isFirstLine())->font().fontDescription().wordSpacing();
+                needsWordSpacing = !isSpaceOrNewline(rt->characterAt(r->m_stop - 1));
+            }
+
+            setLogicalWidthForTextRun(lineBox, r, rt, totalLogicalWidth, lineInfo, textBoxDataMap, verticalPositionCache, wordMeasurements);
+        } else {
+            isAfterExpansion = false;
+            if (!r->m_object->isRenderInline()) {
+                RenderBox* renderBox = toRenderBox(r->m_object);
+                r->m_box->setLogicalWidth(logicalWidthForChild(renderBox).toFloat());
+                totalLogicalWidth += marginStartForChild(renderBox) + marginEndForChild(renderBox);
+            }
+        }
+
+        totalLogicalWidth += r->m_box->logicalWidth();
+        previousObject = r->m_object;
+    }
+
+    if (isAfterExpansion && !expansionOpportunities.isEmpty()) {
+        expansionOpportunities.last()--;
+        expansionOpportunityCount--;
+    }
+
+    updateLogicalWidthForAlignment(textAlign, lineBox, trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth, expansionOpportunityCount);
+
+    computeExpansionForJustifiedText(firstRun, trailingSpaceRun, expansionOpportunities, expansionOpportunityCount, totalLogicalWidth, availableLogicalWidth);
+
+    return r;
+}
+
+void RenderParagraph::computeBlockDirectionPositionsForLine(RootInlineBox* lineBox, BidiRun* firstRun, GlyphOverflowAndFallbackFontsMap& textBoxDataMap,
+                                                        VerticalPositionCache& verticalPositionCache)
+{
+    setLogicalHeight(lineBox->alignBoxesInBlockDirection(logicalHeight(), textBoxDataMap, verticalPositionCache));
+
+    // Now make sure we place replaced render objects correctly.
+    for (BidiRun* r = firstRun; r; r = r->next()) {
+        ASSERT(r->m_box);
+        if (!r->m_box)
+            continue; // Skip runs with no line boxes.
+
+        // Align positioned boxes with the top of the line box.  This is
+        // a reasonable approximation of an appropriate y position.
+        if (r->m_object->isOutOfFlowPositioned())
+            r->m_box->setLogicalTop(logicalHeight().toFloat());
+
+        // Position is used to properly position both replaced elements and
+        // to update the static normal flow x/y of positioned elements.
+        if (r->m_object->isText())
+            toRenderText(r->m_object)->positionLineBox(r->m_box);
+        else if (r->m_object->isBox())
+            toRenderBox(r->m_object)->positionLineBox(r->m_box);
+    }
+}
+
+// This function constructs line boxes for all of the text runs in the resolver and computes their position.
+RootInlineBox* RenderParagraph::createLineBoxesFromBidiRuns(unsigned bidiLevel, BidiRunList<BidiRun>& bidiRuns, const InlineIterator& end, LineInfo& lineInfo, VerticalPositionCache& verticalPositionCache, BidiRun* trailingSpaceRun, WordMeasurements& wordMeasurements)
+{
+    if (!bidiRuns.runCount())
+        return 0;
+
+    // FIXME: Why is this only done when we had runs?
+    lineInfo.setLastLine(!end.object());
+
+    RootInlineBox* lineBox = constructLine(bidiRuns, lineInfo);
+    if (!lineBox)
+        return 0;
+
+    lineBox->setBidiLevel(bidiLevel);
+    lineBox->setEndsWithBreak(lineInfo.previousLineBrokeCleanly());
+
+    GlyphOverflowAndFallbackFontsMap textBoxDataMap;
+
+    // Now we position all of our text runs horizontally.
+    computeInlineDirectionPositionsForLine(lineBox, lineInfo, bidiRuns.firstRun(), trailingSpaceRun, end.atEnd(), textBoxDataMap, verticalPositionCache, wordMeasurements);
+
+    // Now position our text runs vertically.
+    computeBlockDirectionPositionsForLine(lineBox, bidiRuns.firstRun(), textBoxDataMap, verticalPositionCache);
+
+    // Compute our overflow now.
+    lineBox->computeOverflow(lineBox->lineTop(), lineBox->lineBottom(), textBoxDataMap);
+
+    return lineBox;
+}
+
+static void deleteLineRange(LineLayoutState& layoutState, RootInlineBox* startLine, RootInlineBox* stopLine = 0)
+{
+    RootInlineBox* boxToDelete = startLine;
+    while (boxToDelete && boxToDelete != stopLine) {
+        layoutState.updatePaintInvalidationRangeFromBox(boxToDelete);
+        // Note: deleteLineRange(firstRootBox()) is not identical to deleteLineBoxTree().
+        // deleteLineBoxTree uses nextLineBox() instead of nextRootBox() when traversing.
+        RootInlineBox* next = boxToDelete->nextRootBox();
+        boxToDelete->deleteLine();
+        boxToDelete = next;
+    }
+}
+
+void RenderParagraph::layoutRunsAndFloats(LineLayoutState& layoutState)
+{
+    // We want to skip ahead to the first dirty line
+    InlineBidiResolver resolver;
+    RootInlineBox* startLine = determineStartPosition(layoutState, resolver);
+
+    // We also find the first clean line and extract these lines.  We will add them back
+    // if we determine that we're able to synchronize after handling all our dirty lines.
+    InlineIterator cleanLineStart;
+    BidiStatus cleanLineBidiStatus;
+    if (!layoutState.isFullLayout() && startLine)
+        determineEndPosition(layoutState, startLine, cleanLineStart, cleanLineBidiStatus);
+
+    if (startLine) {
+        if (!layoutState.usesPaintInvalidationBounds())
+            layoutState.setPaintInvalidationRange(logicalHeight());
+        deleteLineRange(layoutState, startLine);
+    }
+
+    layoutRunsAndFloatsInRange(layoutState, resolver, cleanLineStart, cleanLineBidiStatus);
+    linkToEndLineIfNeeded(layoutState);
+    markDirtyFloatsForPaintInvalidation(layoutState.floats());
+}
+
+void RenderParagraph::layoutRunsAndFloatsInRange(LineLayoutState& layoutState,
+    InlineBidiResolver& resolver, const InlineIterator& cleanLineStart,
+    const BidiStatus& cleanLineBidiStatus)
+{
+    RenderStyle* styleToUse = style();
+    LineMidpointState& lineMidpointState = resolver.midpointState();
+    InlineIterator endOfLine = resolver.position();
+    bool checkForEndLineMatch = layoutState.endLine();
+    RenderTextInfo renderTextInfo;
+    VerticalPositionCache verticalPositionCache;
+
+    LineBreaker lineBreaker(this);
+
+    while (!endOfLine.atEnd()) {
+        // FIXME: Is this check necessary before the first iteration or can it be moved to the end?
+        if (checkForEndLineMatch) {
+            layoutState.setEndLineMatched(matchedEndLine(layoutState, resolver, cleanLineStart, cleanLineBidiStatus));
+            if (layoutState.endLineMatched()) {
+                resolver.setPosition(InlineIterator(resolver.position().root(), 0, 0), 0);
+                break;
+            }
+        }
+
+        lineMidpointState.reset();
+
+        layoutState.lineInfo().setEmpty(true);
+        layoutState.lineInfo().resetRunsFromLeadingWhitespace();
+
+        bool isNewUBAParagraph = layoutState.lineInfo().previousLineBrokeCleanly();
+        FloatingObject* lastFloatFromPreviousLine = 0;
+
+        WordMeasurements wordMeasurements;
+        endOfLine = lineBreaker.nextLineBreak(resolver, layoutState.lineInfo(), renderTextInfo,
+            lastFloatFromPreviousLine, wordMeasurements);
+        renderTextInfo.m_lineBreakIterator.resetPriorContext();
+        if (resolver.position().atEnd()) {
+            // FIXME: We shouldn't be creating any runs in nextLineBreak to begin with!
+            // Once BidiRunList is separated from BidiResolver this will not be needed.
+            resolver.runs().deleteRuns();
+            resolver.markCurrentRunEmpty(); // FIXME: This can probably be replaced by an ASSERT (or just removed).
+            layoutState.setCheckForFloatsFromLastLine(true);
+            resolver.setPosition(InlineIterator(resolver.position().root(), 0, 0), 0);
+            break;
+        }
+
+        ASSERT(endOfLine != resolver.position());
+
+        // This is a short-cut for empty lines.
+        if (layoutState.lineInfo().isEmpty()) {
+            if (lastRootBox())
+                lastRootBox()->setLineBreakInfo(endOfLine.object(), endOfLine.offset(), resolver.status());
+        } else {
+            VisualDirectionOverride override = (styleToUse->rtlOrdering() == VisualOrder ? (styleToUse->direction() == LTR ? VisualLeftToRightOverride : VisualRightToLeftOverride) : NoVisualOverride);
+            if (isNewUBAParagraph && styleToUse->unicodeBidi() == Plaintext && !resolver.context()->parent()) {
+                TextDirection direction = determinePlaintextDirectionality(resolver.position().root(), resolver.position().object(), resolver.position().offset());
+                resolver.setStatus(BidiStatus(direction, isOverride(styleToUse->unicodeBidi())));
+            }
+            // FIXME: This ownership is reversed. We should own the BidiRunList and pass it to createBidiRunsForLine.
+            BidiRunList<BidiRun>& bidiRuns = resolver.runs();
+            constructBidiRunsForLine(resolver, bidiRuns, endOfLine, override, layoutState.lineInfo().previousLineBrokeCleanly(), isNewUBAParagraph);
+            ASSERT(resolver.position() == endOfLine);
+
+            BidiRun* trailingSpaceRun = resolver.trailingSpaceRun();
+
+            if (bidiRuns.runCount() && lineBreaker.lineWasHyphenated())
+                bidiRuns.logicallyLastRun()->m_hasHyphen = true;
+
+            // Now that the runs have been ordered, we create the line boxes.
+            // At the same time we figure out where border/padding/margin should be applied for
+            // inline flow boxes.
+
+            RootInlineBox* lineBox = createLineBoxesFromBidiRuns(resolver.status().context->level(), bidiRuns, endOfLine, layoutState.lineInfo(), verticalPositionCache, trailingSpaceRun, wordMeasurements);
+
+            bidiRuns.deleteRuns();
+            resolver.markCurrentRunEmpty(); // FIXME: This can probably be replaced by an ASSERT (or just removed).
+
+            if (lineBox) {
+                lineBox->setLineBreakInfo(endOfLine.object(), endOfLine.offset(), resolver.status());
+                if (layoutState.usesPaintInvalidationBounds())
+                    layoutState.updatePaintInvalidationRangeFromBox(lineBox);
+            }
+        }
+
+        for (size_t i = 0; i < lineBreaker.positionedObjects().size(); ++i)
+            setStaticPositions(this, lineBreaker.positionedObjects()[i]);
+
+        if (!layoutState.lineInfo().isEmpty())
+            layoutState.lineInfo().setFirstLine(false);
+
+        lineMidpointState.reset();
+        resolver.setPosition(endOfLine, numberOfIsolateAncestors(endOfLine));
+    }
+}
+
+void RenderParagraph::linkToEndLineIfNeeded(LineLayoutState& layoutState)
+{
+    if (layoutState.endLine()) {
+        if (layoutState.endLineMatched()) {
+            // Attach all the remaining lines, and then adjust their y-positions as needed.
+            LayoutUnit delta = logicalHeight() - layoutState.endLineLogicalTop();
+            for (RootInlineBox* line = layoutState.endLine(); line; line = line->nextRootBox()) {
+                line->attachLine();
+                if (delta) {
+                    layoutState.updatePaintInvalidationRangeFromBox(line, delta);
+                    line->adjustBlockDirectionPosition(delta.toFloat());
+                }
+            }
+            setLogicalHeight(lastRootBox()->lineBottomWithLeading());
+        } else {
+            // Delete all the remaining lines.
+            deleteLineRange(layoutState, layoutState.endLine());
+        }
+    }
+}
+
+void RenderParagraph::markDirtyFloatsForPaintInvalidation(Vector<FloatWithRect>& floats)
+{
+    size_t floatCount = floats.size();
+    // Floats that did not have layout did not paint invalidations when we laid them out. They would have
+    // painted by now if they had moved, but if they stayed at (0, 0), they still need to be
+    // painted.
+    for (size_t i = 0; i < floatCount; ++i) {
+        if (!floats[i].everHadLayout) {
+            RenderBox* f = floats[i].object;
+            if (!f->x() && !f->y() && f->checkForPaintInvalidation()) {
+                f->setShouldDoFullPaintInvalidation(true);
+            }
+        }
+    }
+}
+
+struct InlineMinMaxIterator {
+/* InlineMinMaxIterator is a class that will iterate over all render objects that contribute to
+   inline min/max width calculations.  Note the following about the way it walks:
+   (1) Positioned content is skipped (since it does not contribute to min/max width of a block)
+   (2) We do not drill into the children of floats or replaced elements, since you can't break
+       in the middle of such an element.
+   (3) Inline flows (e.g., <a>, <span>, <i>) are walked twice, since each side can have
+       distinct borders/margin/padding that contribute to the min/max width.
+*/
+    RenderObject* parent;
+    RenderObject* current;
+    bool endOfInline;
+
+    InlineMinMaxIterator(RenderObject* p)
+        : parent(p), current(p), endOfInline(false)
+    {
+
+    }
+
+    RenderObject* next();
+};
+
+RenderObject* InlineMinMaxIterator::next()
+{
+    RenderObject* result = 0;
+    bool oldEndOfInline = endOfInline;
+    endOfInline = false;
+    while (current || current == parent) {
+        if (!oldEndOfInline && (current == parent || (!current->isReplaced() && !current->isOutOfFlowPositioned())))
+            result = current->slowFirstChild();
+
+        if (!result) {
+            // We hit the end of our inline. (It was empty, e.g., <span></span>.)
+            if (!oldEndOfInline && current->isRenderInline()) {
+                result = current;
+                endOfInline = true;
+                break;
+            }
+
+            while (current && current != parent) {
+                result = current->nextSibling();
+                if (result)
+                    break;
+                current = current->parent();
+                if (current && current != parent && current->isRenderInline()) {
+                    result = current;
+                    endOfInline = true;
+                    break;
+                }
+            }
+        }
+
+        if (!result)
+            break;
+
+        if (!result->isOutOfFlowPositioned() && (result->isText() || result->isReplaced() || result->isRenderInline()))
+            break;
+
+        current = result;
+        result = 0;
+    }
+
+    // Update our position.
+    current = result;
+    return current;
+}
+
+static LayoutUnit getBPMWidth(LayoutUnit childValue, Length cssUnit)
+{
+    if (cssUnit.type() != Auto)
+        return (cssUnit.isFixed() ? static_cast<LayoutUnit>(cssUnit.value()) : childValue);
+    return 0;
+}
+
+static LayoutUnit getBorderPaddingMargin(RenderBoxModelObject* child, bool endOfInline)
+{
+    RenderStyle* childStyle = child->style();
+    if (endOfInline) {
+        return getBPMWidth(child->marginEnd(), childStyle->marginEnd()) +
+            getBPMWidth(child->paddingEnd(), childStyle->paddingEnd()) +
+            child->borderEnd();
+    }
+    return getBPMWidth(child->marginStart(), childStyle->marginStart()) +
+        getBPMWidth(child->paddingStart(), childStyle->paddingStart()) +
+        child->borderStart();
+}
+
+static inline void stripTrailingSpace(float& inlineMax, float& inlineMin, RenderObject* trailingSpaceChild)
+{
+    if (trailingSpaceChild && trailingSpaceChild->isText()) {
+        // Collapse away the trailing space at the end of a block.
+        RenderText* t = toRenderText(trailingSpaceChild);
+        const UChar space = ' ';
+        const Font& font = t->style()->font(); // FIXME: This ignores first-line.
+        float spaceWidth = font.width(constructTextRun(t, font, &space, 1, t->style(), LTR));
+        inlineMax -= spaceWidth + font.fontDescription().wordSpacing();
+        if (inlineMin > inlineMax)
+            inlineMin = inlineMax;
+    }
+}
+
+static inline void updatePreferredWidth(LayoutUnit& preferredWidth, float& result)
+{
+    LayoutUnit snappedResult = LayoutUnit::fromFloatCeil(result);
+    preferredWidth = std::max(snappedResult, preferredWidth);
+}
+
+// When converting between floating point and LayoutUnits we risk losing precision
+// with each conversion. When this occurs while accumulating our preferred widths,
+// we can wind up with a line width that's larger than our maxPreferredWidth due to
+// pure float accumulation.
+static inline LayoutUnit adjustFloatForSubPixelLayout(float value)
+{
+    return LayoutUnit::fromFloatCeil(value);
+}
+
+// FIXME: This function should be broken into something less monolithic.
+// FIXME: The main loop here is very similar to LineBreaker::nextSegmentBreak. They can probably reuse code.
+void RenderParagraph::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
+{
+    float inlineMax = 0;
+    float inlineMin = 0;
+
+    RenderStyle* styleToUse = style();
+    RenderBlock* containingBlock = this->containingBlock();
+    LayoutUnit cw = containingBlock ? containingBlock->contentLogicalWidth() : LayoutUnit();
+
+    // If we are at the start of a line, we want to ignore all white-space.
+    // Also strip spaces if we previously had text that ended in a trailing space.
+    bool stripFrontSpaces = true;
+    RenderObject* trailingSpaceChild = 0;
+
+    bool autoWrap, oldAutoWrap;
+    autoWrap = oldAutoWrap = styleToUse->autoWrap();
+
+    InlineMinMaxIterator childIterator(const_cast<RenderParagraph*>(this));
+
+    // Only gets added to the max preffered width once.
+    bool addedTextIndent = false;
+    // Signals the text indent was more negative than the min preferred width
+    bool hasRemainingNegativeTextIndent = false;
+
+    LayoutUnit textIndent = minimumValueForLength(styleToUse->textIndent(), cw);
+    bool isPrevChildInlineFlow = false;
+    bool shouldBreakLineAfterText = false;
+    while (RenderObject* child = childIterator.next()) {
+        autoWrap = child->isReplaced() ? child->parent()->style()->autoWrap() :
+            child->style()->autoWrap();
+
+        // Step One: determine whether or not we need to go ahead and
+        // terminate our current line. Each discrete chunk can become
+        // the new min-width, if it is the widest chunk seen so far, and
+        // it can also become the max-width.
+
+        // Children fall into three categories:
+        // (1) An inline flow object. These objects always have a min/max of 0,
+        // and are included in the iteration solely so that their margins can
+        // be added in.
+        //
+        // (2) An inline non-text non-flow object, e.g., an inline replaced element.
+        // These objects can always be on a line by themselves, so in this situation
+        // we need to go ahead and break the current line, and then add in our own
+        // margins and min/max width on its own line, and then terminate the line.
+        //
+        // (3) A text object. Text runs can have breakable characters at the start,
+        // the middle or the end. They may also lose whitespace off the front if
+        // we're already ignoring whitespace. In order to compute accurate min-width
+        // information, we need three pieces of information.
+        // (a) the min-width of the first non-breakable run. Should be 0 if the text string
+        // starts with whitespace.
+        // (b) the min-width of the last non-breakable run. Should be 0 if the text string
+        // ends with whitespace.
+        // (c) the min/max width of the string (trimmed for whitespace).
+        //
+        // If the text string starts with whitespace, then we need to go ahead and
+        // terminate our current line (unless we're already in a whitespace stripping
+        // mode.
+        //
+        // If the text string has a breakable character in the middle, but didn't start
+        // with whitespace, then we add the width of the first non-breakable run and
+        // then end the current line. We then need to use the intermediate min/max width
+        // values (if any of them are larger than our current min/max). We then look at
+        // the width of the last non-breakable run and use that to start a new line
+        // (unless we end in whitespace).
+        RenderStyle* childStyle = child->style();
+        float childMin = 0;
+        float childMax = 0;
+
+        if (!child->isText()) {
+            // Case (1) and (2). Inline replaced and inline flow elements.
+            if (child->isRenderInline()) {
+                // Add in padding/border/margin from the appropriate side of
+                // the element.
+                float bpm = getBorderPaddingMargin(toRenderInline(child), childIterator.endOfInline).toFloat();
+                childMin += bpm;
+                childMax += bpm;
+
+                inlineMin += childMin;
+                inlineMax += childMax;
+
+                child->clearPreferredLogicalWidthsDirty();
+            } else {
+                // Inline replaced elts add in their margins to their min/max values.
+                LayoutUnit margins = 0;
+                Length startMargin = childStyle->marginStart();
+                Length endMargin = childStyle->marginEnd();
+                if (startMargin.isFixed())
+                    margins += adjustFloatForSubPixelLayout(startMargin.value());
+                if (endMargin.isFixed())
+                    margins += adjustFloatForSubPixelLayout(endMargin.value());
+                childMin += margins.ceilToFloat();
+                childMax += margins.ceilToFloat();
+            }
+        }
+
+        if (!child->isRenderInline() && !child->isText()) {
+            // Case (2). Inline replaced elements and floats.
+            // Go ahead and terminate the current line as far as
+            // minwidth is concerned.
+            LayoutUnit childMinPreferredLogicalWidth = child->minPreferredLogicalWidth();
+            LayoutUnit childMaxPreferredLogicalWidth = child->maxPreferredLogicalWidth();
+            childMin += childMinPreferredLogicalWidth.ceilToFloat();
+            childMax += childMaxPreferredLogicalWidth.ceilToFloat();
+
+            bool canBreakReplacedElement = true;
+            if ((canBreakReplacedElement && (autoWrap || oldAutoWrap) && (!isPrevChildInlineFlow || shouldBreakLineAfterText))) {
+                updatePreferredWidth(minLogicalWidth, inlineMin);
+                inlineMin = 0;
+            }
+
+            // Add in text-indent. This is added in only once.
+            if (!addedTextIndent) {
+                float ceiledTextIndent = textIndent.ceilToFloat();
+                childMin += ceiledTextIndent;
+                childMax += ceiledTextIndent;
+
+                if (childMin < 0)
+                    textIndent = adjustFloatForSubPixelLayout(childMin);
+                else
+                    addedTextIndent = true;
+            }
+
+            // Add our width to the max.
+            inlineMax += std::max<float>(0, childMax);
+
+            if (!autoWrap || !canBreakReplacedElement || (isPrevChildInlineFlow && !shouldBreakLineAfterText)) {
+                inlineMin += childMin;
+            } else {
+                // Now check our line.
+                updatePreferredWidth(minLogicalWidth, childMin);
+
+                // Now start a new line.
+                inlineMin = 0;
+            }
+
+            if (autoWrap && canBreakReplacedElement && isPrevChildInlineFlow) {
+                updatePreferredWidth(minLogicalWidth, inlineMin);
+                inlineMin = 0;
+            }
+
+            // We are no longer stripping whitespace at the start of
+            // a line.
+            stripFrontSpaces = false;
+            trailingSpaceChild = 0;
+        } else if (child->isText()) {
+            // Case (3). Text.
+            RenderText* t = toRenderText(child);
+
+            // Determine if we have a breakable character. Pass in
+            // whether or not we should ignore any spaces at the front
+            // of the string. If those are going to be stripped out,
+            // then they shouldn't be considered in the breakable char
+            // check.
+            bool hasBreakableChar, hasBreak;
+            float firstLineMinWidth, lastLineMinWidth;
+            bool hasBreakableStart, hasBreakableEnd;
+            float firstLineMaxWidth, lastLineMaxWidth;
+            t->trimmedPrefWidths(inlineMax,
+                firstLineMinWidth, hasBreakableStart, lastLineMinWidth, hasBreakableEnd,
+                hasBreakableChar, hasBreak, firstLineMaxWidth, lastLineMaxWidth,
+                childMin, childMax, stripFrontSpaces, styleToUse->direction());
+
+            // This text object will not be rendered, but it may still provide a breaking opportunity.
+            if (!hasBreak && !childMax) {
+                if (autoWrap && (hasBreakableStart || hasBreakableEnd)) {
+                    updatePreferredWidth(minLogicalWidth, inlineMin);
+                    inlineMin = 0;
+                }
+                continue;
+            }
+
+            if (stripFrontSpaces)
+                trailingSpaceChild = child;
+            else
+                trailingSpaceChild = 0;
+
+            // Add in text-indent. This is added in only once.
+            float ti = 0;
+            if (!addedTextIndent || hasRemainingNegativeTextIndent) {
+                ti = textIndent.ceilToFloat();
+                childMin += ti;
+                firstLineMinWidth += ti;
+
+                // It the text indent negative and larger than the child minimum, we re-use the remainder
+                // in future minimum calculations, but using the negative value again on the maximum
+                // will lead to under-counting the max pref width.
+                if (!addedTextIndent) {
+                    childMax += ti;
+                    firstLineMaxWidth += ti;
+                    addedTextIndent = true;
+                }
+
+                if (childMin < 0) {
+                    textIndent = childMin;
+                    hasRemainingNegativeTextIndent = true;
+                }
+            }
+
+            // If we have no breakable characters at all,
+            // then this is the easy case. We add ourselves to the current
+            // min and max and continue.
+            if (!hasBreakableChar) {
+                inlineMin += childMin;
+            } else {
+                if (hasBreakableStart) {
+                    updatePreferredWidth(minLogicalWidth, inlineMin);
+                } else {
+                    inlineMin += firstLineMinWidth;
+                    updatePreferredWidth(minLogicalWidth, inlineMin);
+                    childMin -= ti;
+                }
+
+                inlineMin = childMin;
+
+                if (hasBreakableEnd) {
+                    updatePreferredWidth(minLogicalWidth, inlineMin);
+                    inlineMin = 0;
+                    shouldBreakLineAfterText = false;
+                } else {
+                    updatePreferredWidth(minLogicalWidth, inlineMin);
+                    inlineMin = lastLineMinWidth;
+                    shouldBreakLineAfterText = true;
+                }
+            }
+
+            if (hasBreak) {
+                inlineMax += firstLineMaxWidth;
+                updatePreferredWidth(maxLogicalWidth, inlineMax);
+                updatePreferredWidth(maxLogicalWidth, childMax);
+                inlineMax = lastLineMaxWidth;
+                addedTextIndent = true;
+            } else {
+                inlineMax += std::max<float>(0, childMax);
+            }
+        }
+
+        if (!child->isText() && child->isRenderInline())
+            isPrevChildInlineFlow = true;
+        else
+            isPrevChildInlineFlow = false;
+
+        oldAutoWrap = autoWrap;
+    }
+
+    if (styleToUse->collapseWhiteSpace())
+        stripTrailingSpace(inlineMax, inlineMin, trailingSpaceChild);
+
+    updatePreferredWidth(minLogicalWidth, inlineMin);
+    updatePreferredWidth(maxLogicalWidth, inlineMax);
+
+    maxLogicalWidth = std::max(minLogicalWidth, maxLogicalWidth);
+}
+
+void RenderParagraph::layoutChildren(bool relayoutChildren, SubtreeLayoutScope& layoutScope, LayoutUnit& paintInvalidationLogicalTop, LayoutUnit& paintInvalidationLogicalBottom, LayoutUnit beforeEdge, LayoutUnit afterEdge)
+{
+    // Figure out if we should clear out our line boxes.
+    // FIXME: Handle resize eventually!
+    bool isFullLayout = !firstLineBox() || selfNeedsLayout() || relayoutChildren;
+    LineLayoutState layoutState(isFullLayout, paintInvalidationLogicalTop, paintInvalidationLogicalBottom);
+
+    if (isFullLayout) {
+        // Ensure the old line boxes will be erased.
+        if (firstLineBox())
+            setShouldDoFullPaintInvalidation(true);
+        lineBoxes()->deleteLineBoxes();
+    }
+
+    // Text truncation kicks in in two cases:
+    //     1) If your overflow isn't visible and your text-overflow-mode isn't clip.
+    //     2) If you're an anonymous paragraph with a parent that satisfies #1.
+    // FIXME: CSS3 says that descendants that are clipped must also know how to truncate.  This is insanely
+    // difficult to figure out in general (especially in the middle of doing layout), so we only handle the
+    // simple case of an anonymous block truncating when it's parent is clipped.
+    bool hasTextOverflow = (style()->textOverflow() && hasOverflowClip())
+        || (isAnonymousBlock() && parent() && parent()->style()->textOverflow() && parent()->hasOverflowClip());
+
+    // Walk all the lines and delete our ellipsis line boxes if they exist.
+    if (hasTextOverflow)
+         deleteEllipsisLineBoxes();
+
+    if (firstChild()) {
+        // In full layout mode, clear the line boxes of children upfront. Otherwise,
+        // siblings can run into stale root lineboxes during layout. Then layout
+        // the replaced elements later. In partial layout mode, line boxes are not
+        // deleted and only dirtied. In that case, we can layout the replaced
+        // elements at the same time.
+        Vector<RenderBox*> replacedChildren;
+        for (InlineWalker walker(this); !walker.atEnd(); walker.advance()) {
+            RenderObject* o = walker.current();
+
+            if (!layoutState.hasInlineChild() && o->isInline())
+                layoutState.setHasInlineChild(true);
+
+            if (o->isReplaced() || o->isOutOfFlowPositioned()) {
+                RenderBox* box = toRenderBox(o);
+
+                updateBlockChildDirtyBitsBeforeLayout(relayoutChildren, box);
+
+                if (o->isOutOfFlowPositioned()) {
+                    o->containingBlock()->insertPositionedObject(box);
+                } else if (isFullLayout || o->needsLayout()) {
+                    // Replaced element.
+                    box->dirtyLineBoxes(isFullLayout);
+                    if (isFullLayout)
+                        replacedChildren.append(box);
+                    else
+                        o->layoutIfNeeded();
+                }
+            } else if (o->isText() || (o->isRenderInline() && !walker.atEndOfInline())) {
+                if (!o->isText())
+                    toRenderInline(o)->updateAlwaysCreateLineBoxes(layoutState.isFullLayout());
+                if (layoutState.isFullLayout() || o->selfNeedsLayout())
+                    dirtyLineBoxesForRenderer(o, layoutState.isFullLayout());
+                o->clearNeedsLayout();
+            }
+        }
+
+        for (size_t i = 0; i < replacedChildren.size(); i++)
+            replacedChildren[i]->layoutIfNeeded();
+
+        layoutRunsAndFloats(layoutState);
+    }
+
+    // Expand the last line to accommodate Ruby and emphasis marks.
+    int lastLineAnnotationsAdjustment = 0;
+    if (lastRootBox()) {
+        LayoutUnit lowestAllowedPosition = std::max(lastRootBox()->lineBottom(), logicalHeight() + paddingAfter());
+        lastLineAnnotationsAdjustment = lastRootBox()->computeUnderAnnotationAdjustment(lowestAllowedPosition);
+    }
+
+    // Now add in the bottom border/padding.
+    setLogicalHeight(logicalHeight() + lastLineAnnotationsAdjustment + afterEdge);
+
+    if (!firstLineBox() && hasLineIfEmpty())
+        setLogicalHeight(logicalHeight() + lineHeight(true, HorizontalLine, PositionOfInteriorLineBoxes));
+
+    // See if we have any lines that spill out of our block.  If we do, then we will possibly need to
+    // truncate text.
+    if (hasTextOverflow)
+        checkLinesForTextOverflow();
+
+    // Ensure the new line boxes will be painted.
+    if (isFullLayout && firstLineBox())
+        setShouldDoFullPaintInvalidation(true);
+}
+
+void RenderParagraph::checkFloatsInCleanLine(RootInlineBox* line, Vector<FloatWithRect>& floats, size_t& floatIndex, bool& encounteredNewFloat, bool& dirtiedByFloat)
+{
+    Vector<RenderBox*>* cleanLineFloats = line->floatsPtr();
+    if (!cleanLineFloats)
+        return;
+
+    Vector<RenderBox*>::iterator end = cleanLineFloats->end();
+    for (Vector<RenderBox*>::iterator it = cleanLineFloats->begin(); it != end; ++it) {
+        RenderBox* floatingBox = *it;
+        floatingBox->layoutIfNeeded();
+        LayoutSize newSize(floatingBox->width() + floatingBox->marginWidth(), floatingBox->height() + floatingBox->marginHeight());
+        if (floats[floatIndex].object != floatingBox) {
+            encounteredNewFloat = true;
+            return;
+        }
+
+        if (floats[floatIndex].rect.size() != newSize) {
+            LayoutUnit floatTop = floats[floatIndex].rect.y();
+            LayoutUnit floatHeight = std::max(floats[floatIndex].rect.height(), newSize.height());
+            floatHeight = std::min(floatHeight, LayoutUnit::max() - floatTop);
+            line->markDirty();
+            markLinesDirtyInBlockRange(line->lineBottomWithLeading(), floatTop + floatHeight, line);
+            floats[floatIndex].rect.setSize(newSize);
+            dirtiedByFloat = true;
+        }
+        floatIndex++;
+    }
+}
+
+RootInlineBox* RenderParagraph::determineStartPosition(LineLayoutState& layoutState, InlineBidiResolver& resolver)
+{
+    RootInlineBox* curr = 0;
+    RootInlineBox* last = 0;
+
+    // FIXME: This entire float-checking block needs to be broken into a new function.
+    bool dirtiedByFloat = false;
+    if (!layoutState.isFullLayout()) {
+        size_t floatIndex = 0;
+        for (curr = firstRootBox(); curr && !curr->isDirty(); curr = curr->nextRootBox()) {
+            // If a new float has been inserted before this line or before its last known float, just do a full layout.
+            bool encounteredNewFloat = false;
+            checkFloatsInCleanLine(curr, layoutState.floats(), floatIndex, encounteredNewFloat, dirtiedByFloat);
+            if (encounteredNewFloat)
+                layoutState.markForFullLayout();
+
+            if (dirtiedByFloat || layoutState.isFullLayout())
+                break;
+        }
+        // Check if a new float has been inserted after the last known float.
+        if (!curr && floatIndex < layoutState.floats().size())
+            layoutState.markForFullLayout();
+    }
+
+    if (layoutState.isFullLayout()) {
+        // If we encountered a new float and have inline children, mark ourself to force us to issue paint invalidations.
+        if (layoutState.hasInlineChild() && !selfNeedsLayout()) {
+            setNeedsLayoutAndFullPaintInvalidation(MarkOnlyThis);
+            setShouldDoFullPaintInvalidation(true);
+        }
+
+        // FIXME: This should just call deleteLineBoxTree, but that causes
+        // crashes for fast/repaint tests.
+        curr = firstRootBox();
+        while (curr) {
+            // Note: This uses nextRootBox() insted of nextLineBox() like deleteLineBoxTree does.
+            RootInlineBox* next = curr->nextRootBox();
+            curr->deleteLine();
+            curr = next;
+        }
+        ASSERT(!firstLineBox() && !lastLineBox());
+    } else {
+        if (curr) {
+            // We have a dirty line.
+            if (RootInlineBox* prevRootBox = curr->prevRootBox()) {
+                // We have a previous line.
+                if (!dirtiedByFloat && (!prevRootBox->endsWithBreak() || !prevRootBox->lineBreakObj() || (prevRootBox->lineBreakObj()->isText() && prevRootBox->lineBreakPos() >= toRenderText(prevRootBox->lineBreakObj())->textLength())))
+                    // The previous line didn't break cleanly or broke at a newline
+                    // that has been deleted, so treat it as dirty too.
+                    curr = prevRootBox;
+            }
+        } else {
+            // No dirty lines were found.
+            // If the last line didn't break cleanly, treat it as dirty.
+            if (lastRootBox() && !lastRootBox()->endsWithBreak())
+                curr = lastRootBox();
+        }
+
+        // If we have no dirty lines, then last is just the last root box.
+        last = curr ? curr->prevRootBox() : lastRootBox();
+    }
+
+    layoutState.lineInfo().setFirstLine(!last);
+    layoutState.lineInfo().setPreviousLineBrokeCleanly(!last || last->endsWithBreak());
+
+    if (last) {
+        setLogicalHeight(last->lineBottomWithLeading());
+        InlineIterator iter = InlineIterator(this, last->lineBreakObj(), last->lineBreakPos());
+        resolver.setPosition(iter, numberOfIsolateAncestors(iter));
+        resolver.setStatus(last->lineBreakBidiStatus());
+    } else {
+        TextDirection direction = style()->direction();
+        if (style()->unicodeBidi() == Plaintext)
+            direction = determinePlaintextDirectionality(this);
+        resolver.setStatus(BidiStatus(direction, isOverride(style()->unicodeBidi())));
+        InlineIterator iter = InlineIterator(this, bidiFirstSkippingEmptyInlines(this, resolver.runs(), &resolver), 0);
+        resolver.setPosition(iter, numberOfIsolateAncestors(iter));
+    }
+    return curr;
+}
+
+void RenderParagraph::determineEndPosition(LineLayoutState& layoutState, RootInlineBox* startLine, InlineIterator& cleanLineStart, BidiStatus& cleanLineBidiStatus)
+{
+    ASSERT(!layoutState.endLine());
+    size_t floatIndex = layoutState.floatIndex();
+    RootInlineBox* last = 0;
+    for (RootInlineBox* curr = startLine->nextRootBox(); curr; curr = curr->nextRootBox()) {
+        if (!curr->isDirty()) {
+            bool encounteredNewFloat = false;
+            bool dirtiedByFloat = false;
+            checkFloatsInCleanLine(curr, layoutState.floats(), floatIndex, encounteredNewFloat, dirtiedByFloat);
+            if (encounteredNewFloat)
+                return;
+        }
+        if (curr->isDirty())
+            last = 0;
+        else if (!last)
+            last = curr;
+    }
+
+    if (!last)
+        return;
+
+    // At this point, |last| is the first line in a run of clean lines that ends with the last line
+    // in the block.
+
+    RootInlineBox* prev = last->prevRootBox();
+    cleanLineStart = InlineIterator(this, prev->lineBreakObj(), prev->lineBreakPos());
+    cleanLineBidiStatus = prev->lineBreakBidiStatus();
+    layoutState.setEndLineLogicalTop(prev->lineBottomWithLeading());
+
+    for (RootInlineBox* line = last; line; line = line->nextRootBox())
+        line->extractLine(); // Disconnect all line boxes from their render objects while preserving
+                             // their connections to one another.
+
+    layoutState.setEndLine(last);
+}
+
+bool RenderParagraph::checkPaginationAndFloatsAtEndLine(LineLayoutState& layoutState)
+{
+    // FIXME(sky): Remove this.
+    return true;
+}
+
+bool RenderParagraph::matchedEndLine(LineLayoutState& layoutState, const InlineBidiResolver& resolver, const InlineIterator& endLineStart, const BidiStatus& endLineStatus)
+{
+    if (resolver.position() == endLineStart) {
+        if (resolver.status() != endLineStatus)
+            return false;
+        return checkPaginationAndFloatsAtEndLine(layoutState);
+    }
+
+    // The first clean line doesn't match, but we can check a handful of following lines to try
+    // to match back up.
+    static int numLines = 8; // The # of lines we're willing to match against.
+    RootInlineBox* originalEndLine = layoutState.endLine();
+    RootInlineBox* line = originalEndLine;
+    for (int i = 0; i < numLines && line; i++, line = line->nextRootBox()) {
+        if (line->lineBreakObj() == resolver.position().object() && line->lineBreakPos() == resolver.position().offset()) {
+            // We have a match.
+            if (line->lineBreakBidiStatus() != resolver.status())
+                return false; // ...but the bidi state doesn't match.
+
+            bool matched = false;
+            RootInlineBox* result = line->nextRootBox();
+            layoutState.setEndLine(result);
+            if (result) {
+                layoutState.setEndLineLogicalTop(line->lineBottomWithLeading());
+                matched = checkPaginationAndFloatsAtEndLine(layoutState);
+            }
+
+            // Now delete the lines that we failed to sync.
+            deleteLineRange(layoutState, originalEndLine, result);
+            return matched;
+        }
+    }
+
+    return false;
+}
+
+void RenderParagraph::deleteEllipsisLineBoxes()
+{
+    ETextAlign textAlign = style()->textAlign();
+    bool ltr = style()->isLeftToRightDirection();
+    bool firstLine = true;
+    for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
+        if (curr->hasEllipsisBox()) {
+            curr->clearTruncation();
+
+            // Shift the line back where it belongs if we cannot accomodate an ellipsis.
+            float logicalLeft = logicalLeftOffsetForLine(firstLine).toFloat();
+            float availableLogicalWidth = logicalRightOffsetForLine(false) - logicalLeft;
+            float totalLogicalWidth = curr->logicalWidth();
+            updateLogicalWidthForAlignment(textAlign, curr, 0, logicalLeft, totalLogicalWidth, availableLogicalWidth, 0);
+
+            if (ltr)
+                curr->adjustLogicalPosition((logicalLeft - curr->logicalLeft()), 0);
+            else
+                curr->adjustLogicalPosition(-(curr->logicalLeft() - logicalLeft), 0);
+        }
+        firstLine = false;
+    }
+}
+
+void RenderParagraph::checkLinesForTextOverflow()
+{
+    // Determine the width of the ellipsis using the current font.
+    // FIXME: CSS3 says this is configurable, also need to use 0x002E (FULL STOP) if horizontal ellipsis is "not renderable"
+    const Font& font = style()->font();
+    DEFINE_STATIC_LOCAL(AtomicString, ellipsisStr, (&horizontalEllipsis, 1));
+    const Font& firstLineFont = firstLineStyle()->font();
+    // FIXME: We should probably not hard-code the direction here. https://crbug.com/333004
+    TextDirection ellipsisDirection = LTR;
+    float firstLineEllipsisWidth = firstLineFont.width(constructTextRun(this, firstLineFont, &horizontalEllipsis, 1, firstLineStyle(), ellipsisDirection));
+    float ellipsisWidth = (font == firstLineFont) ? firstLineEllipsisWidth : font.width(constructTextRun(this, font, &horizontalEllipsis, 1, style(), ellipsisDirection));
+
+    // For LTR text truncation, we want to get the right edge of our padding box, and then we want to see
+    // if the right edge of a line box exceeds that.  For RTL, we use the left edge of the padding box and
+    // check the left edge of the line box to see if it is less
+    // Include the scrollbar for overflow blocks, which means we want to use "contentWidth()"
+    bool ltr = style()->isLeftToRightDirection();
+    ETextAlign textAlign = style()->textAlign();
+    bool firstLine = true;
+    for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
+        float currLogicalLeft = curr->logicalLeft();
+        LayoutUnit blockRightEdge = logicalRightOffsetForLine(firstLine);
+        LayoutUnit blockLeftEdge = logicalLeftOffsetForLine(firstLine);
+        LayoutUnit lineBoxEdge = ltr ? currLogicalLeft + curr->logicalWidth() : currLogicalLeft;
+        if ((ltr && lineBoxEdge > blockRightEdge) || (!ltr && lineBoxEdge < blockLeftEdge)) {
+            // This line spills out of our box in the appropriate direction.  Now we need to see if the line
+            // can be truncated.  In order for truncation to be possible, the line must have sufficient space to
+            // accommodate our truncation string, and no replaced elements (images, tables) can overlap the ellipsis
+            // space.
+
+            LayoutUnit width = firstLine ? firstLineEllipsisWidth : ellipsisWidth;
+            LayoutUnit blockEdge = ltr ? blockRightEdge : blockLeftEdge;
+            if (curr->lineCanAccommodateEllipsis(ltr, blockEdge, lineBoxEdge, width)) {
+                float totalLogicalWidth = curr->placeEllipsis(ellipsisStr, ltr, blockLeftEdge.toFloat(), blockRightEdge.toFloat(), width.toFloat());
+
+                float logicalLeft = 0; // We are only intersted in the delta from the base position.
+                float availableLogicalWidth = (blockRightEdge - blockLeftEdge).toFloat();
+                updateLogicalWidthForAlignment(textAlign, curr, 0, logicalLeft, totalLogicalWidth, availableLogicalWidth, 0);
+                if (ltr)
+                    curr->adjustLogicalPosition(logicalLeft, 0);
+                else
+                    curr->adjustLogicalPosition(logicalLeft - (availableLogicalWidth - totalLogicalWidth), 0);
+            }
+        }
+        firstLine = false;
+    }
+}
 
 } // namespace blink